I keep it broken out in a few different ways. The daily sheet has the formulation, name, active ingredient, volume, and property name on it. Same stuff you need on the container/tank tag.
I have the address, area, and property and contract in a contract book, and I break it out by dates in Quickbooks when I bill (Leaving me a concise record of application dates, weather, etc...)
The only PITA is standing in the shop while the inspector tosses the folders around without looking at them. Otherwise, I have a complete history of everything that I shoot.